GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Thermal break for a range hood vent?

mattseab | Posted in Energy Efficiency and Durability on

I am about to install my range hood, a low cfm broan model I learned about on GBA, and will be using a luxury metals exterior vent, something I also learned about on GBA, and was wondering what I can do to reduce the thermal bridge between the exterior vent and interior hood.  Normally one would use sheet metal btwn the two but this seems to create a very undesirable thermal bridge ripe for conducting undesirable temperatures in especially when it’s ten degrees outside.  I have taken great pains to seal and insulate my house and am very happy with its performance, so I’d like to minimize what I presume will be a semi-significant thermal bridge.  As always, thanks in advance for the advice,


GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  1. GBA Editor
    Martin Holladay | | #1

    You'll just have to live with a thermal bridge. It's a necessary part of a system that exhausts air from your kitchen to the outdoors.

    Your front door is also undesirable from a thermal perspective, but it's there for a reason -- so you can enter the house. You can't eliminate your front door, so you just have to get used to the thermal penalty associated with the door.

    If the exhaust duct really bothers you, you can consult your local code authority to see if you can eliminate the duct. Some Passive House builders have been given permission to use a range hood with a recirculating fan connected to a charcoal filter instead of an exhaust fan that is ducted outdoors. But even those houses have an HRV with ducts to the exterior.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |